Hi folks, need some help on this. Renovating a 1960s dormer and getting to the downstairs. I want to install wet ufh and plan to swap out the existing suspended floor with a insulated solid floor. I have taken a few sheets of subfloor up to see what's going on. The current build up is concrete with a dwarf wall and joists on top giving about 30cm to fill. What I'm not sure about is, what the existing concrete is. It could be a thin oversite, with little else underneath it of thicker concrete pad with compacted base or something in the middle. There doesn't seem to be any evidence of a dpm or radon barrier.Also, not sure this helps but the internal brick walls appear to be built off bricks laid on their sides. I plan to drill a couple of test holes or take some up and see what we've got.
if it's a relatively thin oversite (<10cm) would it need to come out and be replaced with compacted hardcore/sand/dpm etc, or would 50-60years settling compact enough to start from there. Ie level with sand then dpm insulation and so on. Same question if turns out to be a thicker layer. Should it stay or go.
any recommendations or advice
thanks
if it's a relatively thin oversite (<10cm) would it need to come out and be replaced with compacted hardcore/sand/dpm etc, or would 50-60years settling compact enough to start from there. Ie level with sand then dpm insulation and so on. Same question if turns out to be a thicker layer. Should it stay or go.
any recommendations or advice
thanks
